OMAPDSS: MANAGER/APPLY: Add runtime_pm protection around wait_for_go/vsync functions

If DSS suspends within the functions dss_mgr_wait_for_go(),
dss_mgr_wait_for_go_ovl() or dss_mgr_wait_for_vsync(). It may lose it's clock
and lead to a register access failure.

Request runtime_pm around these functions.

[archit@ti.com: Moved runtime_pm calls to wait_for_go/vsync functions rather
then calling them from omap_dispc_wait_for_irq_interruptible_timeout()]

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

2 files changed, 23 insertions, 1 deletions

diff --git a/drivers/video/omap2/dss/apply.c b/drivers/video/omap2/dss/apply.c
index b0264a164652..f145e9cd6edd 100644
--- a/drivers/video/omap2/dss/apply.c
+++ b/drivers/video/omap2/dss/apply.c
@@ -391,6 +391,10 @@ int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr)
         if (mgr_manual_update(mgr))
                 return 0;
 
+        r = dispc_runtime_get();
+        if (r)
+                return r;
+
         irq = dispc_mgr_get_vsync_irq(mgr->id);
 
         mp = get_mgr_priv(mgr);
@@ -431,6 +435,8 @@ int dss_mgr_wait_for_go(struct omap_overlay_manager *mgr)
                 }
         }
 
+        dispc_runtime_put();
+
         return r;
 }
 
@@ -454,6 +460,10 @@ int dss_mgr_wait_for_go_ovl(struct omap_overlay *ovl)
         if (ovl_manual_update(ovl))
                 return 0;
 
+        r = dispc_runtime_get();
+        if (r)
+                return r;
+
         irq = dispc_mgr_get_vsync_irq(ovl->manager->id);
 
         op = get_ovl_priv(ovl);
@@ -494,6 +504,8 @@ int dss_mgr_wait_for_go_ovl(struct omap_overlay *ovl)
                 }
         }
 
+        dispc_runtime_put();
+
         return r;
 }
 
diff --git a/drivers/video/omap2/dss/manager.c b/drivers/video/omap2/dss/manager.c
index d1858e71c64e..e7364603f6a1 100644
--- a/drivers/video/omap2/dss/manager.c
+++ b/drivers/video/omap2/dss/manager.c
@@ -494,6 +494,11 @@ static int dss_mgr_wait_for_vsync(struct omap_overlay_manager *mgr)
 {
         unsigned long timeout = msecs_to_jiffies(500);
         u32 irq;
+        int r;
+
+        r = dispc_runtime_get();
+        if (r)
+                return r;
 
         if (mgr->device->type == OMAP_DISPLAY_TYPE_VENC) {
                 irq = DISPC_IRQ_EVSYNC_ODD;
@@ -505,7 +510,12 @@ static int dss_mgr_wait_for_vsync(struct omap_overlay_manager *mgr)
                 else
                         irq = DISPC_IRQ_VSYNC2;
         }
-        return omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);
+
+        r = omap_dispc_wait_for_irq_interruptible_timeout(irq, timeout);
+
+        dispc_runtime_put();
+
+        return r;
 }
 
 int dss_init_overlay_managers(struct platform_device *pdev)